This bottom joint, L5 - S1, is also known as thelumbosacral joint.

The sacrum is a triangular bone that is wedged in between the back of the two hip bones.

This helps provide both support and balance to your body in many different positions.

A human spine and pelvis model

1Photodiva / Getty Images

The Lumbosacral Angle Defined

Your whole spine sits on top of the lowest sacrum bone.

The degree of sacral base tilt varies between individuals and can range between steep and flat.

It is one of the common problems at the L5-sacrum joint.

This condition can occur at any age, but the cause at each age differs.

These changes and injuries can affect anyone, and the lumbosacral angle may have some effect on the risk.

Can Exercise Improve a Lumbosacral Angle?

An analysis of 35 patients.Asian Spine J.2021 Oct;15(5):596-603. doi:10.31616/asj.2020.0252